Bentley Speed Six 1929

As the four-cylinder engine, Bentley included straight-6 overhead cam, four valves per cylinder and two spark plugs per cylinder, technology unusual at the time, and a block in one piece cylinder and iron yoke, and so no head gasket to blow. The standard Bentley 6 ½-liter Bentley Speed ​​Six high efficiency are sports and luxury cars on the basis of Bentley rolling chassis production in 1926/30. The Speed ​​Six, introduced in 1928, Bentley became the most successful racing. Two Bentley Speed ​​Six was known as the Blue Train Bentleys after the engagement of their shopping Woolf Barnato Blue Train owner in 1930. Although based on the Bentley 3-liter, included many improvements. The cone clutch type has been replaced by a drawing-plate dry, comprising a clutch brake for fast switching, and fins four wheels, drum brakes have been used. The front brake drums had 4 leading shoes in each drum [citation needed] and the brakes were also approved. Using a compensation device patented by the driver can adjust the four brakes to correct wear while driving. This was particularly beneficial during the race.